The damage type that Kog'Maw deals is mostly Physical Damage.
Kog'Maw's damage type breakdowns as follows:
Upon dying, Kog'Maw starts a chain reaction in his body which causes him to move faster and detonate after 4 seconds dealing 140 - 650 (based on level) true damage to surrounding enemies.
Passive: Kog'Maw gains 10/15/20/25/30% bonus attack speed.Active: Launches a corrosive projectile that deals 90/140/190/240/290 (+70% bonus Ability Power) Magic Damage to the first enemy hit and shreds its Armor and Magic Resist by 23/25/27/29/31% for 4 seconds.
For 8 seconds, Kog'Maw's basic attacks gain 130/150/170/190/210 range and deal 3.5/4.25/5/5.75/6.5% (+1% per 100 ability power) of the target's maximum health as bonus magic damage.
Deals 75/120/165/210/255 (+70% bonus Ability Power) Magic Damage to enemies hit and leaves a trail on the ground for 4 seconds, slowing enemies in it by 30/35/40/45/50%.
Fires an artillery shot, damaging enemies above 40% health for 100/140/180 (+65% bonus Attack Damage) (+35% bonus Ability Power) to 150/210/270 (+97.5% bonus Attack Damage) (+37.5% bonus Ability Power) magic damage based on their missing health.If enemies are below 40% health, they take 200/280/360 (+130% bonus Attack Damage) (+50% bonus Ability Power) magic damage instead.Each subsequent shot within 8 seconds costs 40 more Mana (max 400).
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